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排序方式: 共有122条查询结果,搜索用时 93 毫秒
11.
V. I. Petrenko M. V. Avdeev V. M. Garamus M. Kubovcikova Z. Gažová K. Šipošová L. A. Bulavin L. Almásy V. L. Aksenov P. Kopcansky 《Physics of the Solid State》2014,56(1):129-133
The structure of filament amyloid aggregates of hen egg white lysozyme in water has been investigated by the small-angle X-ray scattering method. The experimental data are described by different cylindrical models, among which the best agreement is reached with the long helix model. A comparison of the results with the small-angle neutron scattering data reveals the influence of the heavy component of the solvent (a H2O/D2O mixture) on the structure of the filaments. 相似文献
12.
S. A. Samoylenko S. E. Kichanov A. V. Belushkin D. P. Kozlenko V. M. Garamus V. S. Gurin E. A. Trusova G. P. Shevchenko S. K. Rakhmanov L. A. Bulavin B. N. Savenko 《Physics of the Solid State》2011,53(12):2431-2434
The structural aspects of the formation of Ti-Ce-O nanoclusters in silicate glasses doped with oxides TiO2 and CeO2 have been studied by means of small-angle neutron scattering. It has been obtained that, in such glasses, complex oxide nanoclusters with sizes of 300–380 Å are formed; their average size increases and the fractal dimension is changed as the concentration of the initial oxides increases. Correlation between the structural characteristics of the nanoclusters and the optical properties of the doped silicate glasses is discussed. 相似文献
13.
针对纤维材料变温环境力学性能测试的需要,在华中科技大学研制的纤维材料试验机的基础上引入了温控装置,从而实现纤维材料在高低温环境下的力学性能测试。采用该装置对不同直径微米铜丝在不同温度、不同拉伸速率条件下的力学性能开展实验研究,测试结果表明弹性模量和抗拉强度随温度的降低而线性增加,屈服强度的变化不太明显。另外,低温环境下微米铜丝的力学性能表现出与其直径相关的尺度效应,而这一现象在常温下一直没有观测到。最后,还研究了拉伸速率对微米铜丝的力学性能影响,结果表明,在现有装置的许用范围之内,拉伸速率对其力学性能的影响不大。 相似文献
14.
L. A. Bulavin L. L. Jenkovszky S. M. Troshin N. E. Tyurin 《Physics of Particles and Nuclei》2010,41(6):924-927
We argue that the nucleon seen in the Bjorken scaling region is a gas of quasi-free partons. As x decreases, for certain values of Q
2 the partons in a nucleon coalesce to a liquid (saturation). Experimentally this phenomenon is manifested as the turn-over
of the structure function derivatives. The phenomenon can be quantified in the framework of statistical models, percolation
and other approaches to collective effects in the strongly interacting matter. Similarities and differences between the case
of lepton-hadron, hadron-hadron and heavy-ion collisions are discussed. 相似文献
15.
L. A. Bulavin V. G. Kravets K. L. Vinnichenko D. Yu. Man'ko 《Journal of Applied Spectroscopy》2001,68(5):783-790
The optical properties of amorphous and nanocrystalline tapes of CoFeNiSiB alloys and the ac magnetoresistive effect in them have been investigated. It is shown that the magnetoresistive effect in these alloys increases by about a factor of two after lowtemperature treatment and subsequent laser annealing of these tapes in an external magnetic field. Correlation between the anomalous behavior of the dielectric function of these alloys in the IR region of the spectrum and their magnetoresistive characteristics after thermal annealings has been established. The interrelation between the density of localized electronic states near the Fermi level and the value of the magnetoresistive effect has been revealed. The influence of the induced magnetic anisotropy on the transverse permeability in amorphous and nanocrystalline CoFeNiSiB alloys and, consequently, also on the magnetoresistive effect has been analyzed. 相似文献
16.
In this paper we apply the relations between the critical points of the Lennard-Jones fluids and lattice gas model found in [V. L. Kulinskii, J. Phys. Chem. B 114, 2852 (2010)] to other short-ranged potentials like Buckingham and the Mie-potentials. The estimates for the corresponding critical point loci correlate quite satisfactory with the available numerical data for these potentials. The explanation for the correlation between the value of the second virial coefficient at the critical temperature and the particle volume found in [G. A. Vliegenthart and H. N. W. Lekkerkerker, J. Chem. Phys. 112, 5364 (2000)] is proposed. The connection of the stability of the liquid phase with the short range character of the potentials is discussed on the basis of the global isomorphism approach. 相似文献
17.
D. V. Solov’ev A. I. Kuklin P. K. Utrobin A. N. Ozerin T. S. Kurkin O. I. Ivan’kov L. A. Bulavin V. I. Gordelii 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2011,5(1):7-10
The results of a study of the temperature and pressure dependence of isothermal compressibility of dimyristoylphosphatidylcholine
(DMPC) are presented. The data were obtained using a small-angle X-ray scattering instrument in the Institute of Synthetic
Polymer Materials (Moscow, Russia) and a device designed in the Laboratory of Neutron Physics, Joint Institute for Nuclear
Research (Dubna, Russia), for studying the liquid systems by a volumetric P-V-T method. The minute baric investigation of the region of the main phase transition (transition from the gel phase into the
liquid crystalline phase) was carried out. The points of the main phase transition were determined, and the phase diagram
of DMPC was plotted over the pressure range of 1–800 bar at temperature from 24 to 35°C. 相似文献
18.
It has been shown that, apart from classical vacancies formed as a result of the thermal fluctuations, a crystal can contain
so-called nonclassical vacancies of nonfluctuation nature. The latter vacancies appear when the temperature exceeds a critical
value T
C
. The factor responsible for their formation is a mechanical instability of an ideal crystal. The temperature T
C
is a second-order phase transition point. The vacancies formed as a result of this phase transition are joined together into
small clusters with sizes of the order of several atoms. The above transition makes a substantial contribution to the premelting
process observed experimentally. 相似文献
19.
This paper deals with robustness of adaptive control of continuoussystems subject to known output delay, input saturation, unmodelledlinear dynamics, and bounded disturbances. A simple gradient-typealgorithm with a relative deadzone is used. The relative deadzoneis built with an estimated contribution of the unmodelled dynamicsto the system output. The basic tool used for stability androbustness analysis is Gronwall's lemma. 相似文献
20.
L. G. Bulavin 《Russian Chemical Bulletin》1961,10(11):1963-1964